Y型分支管内气固两相流动的数值模拟

Numerical Simulation of Gas-solid two Phase Flow in Y-shape Branch Pipe

本文采用Euler-Lagrange两相流研究方法,固相采用离散相(DPM)模型,对三种不同夹角的Y型分支管内气固两相流动进行了数值模拟。气相湍流采用Realizablek-ε模型,固相的湍流耗散采用随机轨道模型。模拟结果较好地预估了颗粒在分叉处的流动形态、颗粒在分支管内的运动轨迹,以及重新实现颗粒相流场均匀分布所需的距离。同时发现,随机轨道模型较适于评估分支与主管夹角较大情况下,固体颗粒在分叉处的运动。将分支管内固体颗粒质量分配的数值模拟结果与试验结果比较,发现两者较吻合,相对误差较小。

Numerical simulation was performed to study the gas-solid two phase flow in three Y-shape branch pipes with different included angles by using Euler-Lagrange method. The discrete phase model was performed for the solid phase. Realizable κ-ε model and stochastic track were involved in the calculation of turbulence dispersion of two phases. The results of simulation show a good prediction of the particle behavior on the locale of divergence, particle track in subordinate pipes, and the distance needed for re-distribution of solid phase to reach a uniform state. Stochastic track is better for those particles in a Yshape branch pipe whose subordinate pipe has a greater angle with main pipe. The simulation results of the mass distribution of solid phase show an agreement with the experimental results with a small relative error.